Device for cementing wells



April 24, 192s. 1,667,649 A. BOYNTON DEVICE FOR CESETNTINCI WELLS Filed DCC. 4, 1925 ATTORNEYS Y i l f -Pa'enad Apr. 24,1928.

ALExANDEn BOYN'rON,

PATENT fernen or SAN' AN'ro'NIo, Taxes DEVICE- FOB CEMENTING WELLS.. f

Application led December 4, 1925. Serial No. 78,189.

This invention relates to a device Vfor cementing wells and is of 'the type disclosed in my ,co-pending applications for methods'lof and devices for cementing wells tiled October 1, 1925, Serial No.' 59,887 and filed October 1, 1925, Serial No. 59,888.

The object of the present invention is to provide a novel form of device adapted for use in carryingout the method set out in the l0 coriding vapplications referred to and whlchfmakes provisionv for the escape of gas in the cementation of onefstring wells. This` feature has the advantage of'avoiding agitation of the cement. It is well known that `5 cement which is agitated while still .in a liquid 0r semi-liquid state will not set. This advantage is/had in the present case without losing the advantage valve.

A further object resides in the provision of a lnovel form of combined back pressure 4valve and seatfor the combined signal `ball and valvewhich is so organized with the casing as to be held against spinning when the i v cement and the seat and .back pressure valve l -are being drilled out after the cement is set. The present invention also provides means for preventing any of the connections from backing o when .the cementing device is 'be- 0 ing drilled out.

Other objects and advantages reside in certain novel features of the construction, ar-

f" rangement and combination of parts which will be hereinafter more fully described and 15 particularly pointed out in' the appended claims, reference being had to theA accom. panying drawings forming a part of this specification, and in which Figure 1 is a-view partly in vertical sec- 0 t-ion and partly. in elevation, showing a portion of a device adapted for use in Acementing one-string wells,

Figure 2 is a similar view of a form of the invention adapted, for use in cementing two- .45 string wells, and A y Fi ure 3 is a LView in horizontalsection on the l1ne'3--3 of Figure 1. s v

Referring to the drawings it will be seen that in -both forms'of the invention there is 59 vprovided acylindricsal body portion 1 which 1s incorporated in the string of tubing or 'casing and which has diametrically Aopposite cement discharge openings 2 controlled by a rubber sleeve valve 3 held in position by re- 'i'taining cups 4 and `having discharge op'ii? ings 5 staggered with respect to the openings 2 (see Fig. 3). o .T

A 4coupling member 6 isscr'ewed'onto the upper end of the body 1 and serves to connect the body with the next uppermost. section of the string of well casing (not shown)I Hollow headed set screws 6a are-engaged' with the coupling member and body portion to prevent the coupling member from backing off when the cementing device is being drilled out. A combined signal and differential loat'valve seat, designated generally'at 7, is provided and has a. flange 8 threadedly connected with internal threads on the coupling member 6 and'locked in position by locking screws or hollow headed setscrews 9. The

locking screws 9 .prevent'spinning of the. 0f the back pressure `)arts 7 when the same are being drilled out fter the celffent is set. -The flange 8 not only provides amounting means for the partitionv 7 but also provides a valve seat for a back pressure valve 10. In the form of the invention shown in Figure 2l the valve 10 has its edge beveled olif', as at 11, and the flange 8 is similarly .beveledoh as at- 12. In other respects back pressure valves are the same in both embodiments. Each back pressure valve 10 is mounted for sliding movement on a guide stud 13 fixedly secured on a cross bar v 14 carried by the partition 7. A spring 15 abuts lthe underside of the back pressurevalve 10 and also a collar 16 is provided on 'the lower end of the stud 13. This is the ordinary back pressure valve widely used in,

oil well practice. The part 7 not only includes the flange 8 but also a substantially double cone-shaped lshell .or member 16, the

upper cone 17 of which provides a' seat for the combined differential float valve Vand sig' nal ball 18. -Asdisclosed in my co-pending, application this combined ditfere'ntlal floatvalve and signal ball includes a ball member 18a'and a handle member 18", the handle` lower end of the body 1 andthe barrier plate ,is locked in position by means of hollow 1 headed lock screws 22 which 'are .identical with the lock screws 9.` The coupllng 21 1s' also prevented vfrom backing of' when the cementing device is being drilled out byjvirtue of the provision of the hollow headed set screws or lock screws 21.

In order to provide for the outlet of any gas, oil or water under pressure that .may be encountered Without permitting the Igas n to disturb the liquid cement on outside of the casing, an outlet tube 23 is provided and extends down through an opening 24 provided therefor in 'the plate 20. The lower end of the opening 2a is flared and the lower end of the tube 23 is swedged or displaced outwardly, as at 23, .against the ilared'lowern end of opening 24. The upper end of the tube 23- is connected win-th the `lower end of the stud 13 and the stud is' formed with a lengthwise passage onopening which opens out to above the back pres sure valve.l A ball valve 26 is provided and co-acts with aseat 27 provided around 'the passage 25 at the upper end thereof. This ball valve 26 is Welded or' otherwise suitably secured t0 a valve rod 28 which extends down through the tube 23 and has an angullarly bent end 29 to limit its upward displacement. The ball valve 26 prevents the 'cement from flowing downl through the tube but permits the escape of gas. By thus providing for the escape of gas agitation of the liquidcement isprevented and the same is given an opportunity'to properly set.

In the form of the invention shown in Figure -2, the barrier plate 20 is omitted and a setI shoe locked in position by hollow headed set screws v36 replaces the coupling member 21j. The o utlet tube 28l is also omitted but the outlet passage 25 remains in the stud 13 and as before has a valve seat v 27 at its upper end with which the ball valvev 26 co'acts. The ball'va-lve also has a valve rod 28Fsecured thereto. The lvalve rod 28 is shorter than the valve rod 28 and terminates below the stud 13 in an outturned end 29.

I claim.: l 1. A. device for cementing wells includmg a combined back pressure valve seat and lseat for a differential oat and valve .3. A device for cementing wells including ,a tubular member fhaving its opposite ends flared one of the flared ends providing a'seat for a' differential float and valve, the other flared end having a peripheral flange, a back pressure valve adapted to engage the an'ge, said back pressure valve being provided with an opening, a tubular member slidably mounted in' said opening, a valve at one end of the tubular member and adjacent the .dif-

ferential float and valve. ALEXANDER BOYNTON. 

